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url: /reference/Class.TsconfigCache.md
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# Class: TsconfigCache

Cache for tsconfig resolution to avoid redundant file system operations.

The cache stores resolved tsconfig configurations keyed by their file paths.
When transforming multiple files in the same project, tsconfig lookups are
deduplicated, improving performance.
Pass a tsconfig path to use that configuration for every lookup. When the
path is omitted, the nearest tsconfig is discovered automatically.

## Extends

* `TsconfigCache`

## Constructors

### Constructor

* **Type**: (`pathToTsconfig?`: `string`) => `TsconfigCache`
* **Experimental**

#### Parameters

##### pathToTsconfig?

`string`

#### Returns

`TsconfigCache`

#### Overrides

`OriginalTsconfigCache.constructor`

## Methods

### clear()

* **Type**: () => `void`
* **Experimental**

Clear the cache.

Call this when tsconfig files have changed to ensure fresh resolution.

#### Returns

`void`

#### Inherited from

`OriginalTsconfigCache.clear`

***

### size()

* **Type**: () => `number`
* **Experimental**

Get the number of cached entries.

#### Returns

`number`

#### Inherited from

`OriginalTsconfigCache.size`